Spraying apparatus



June 28, 1938. H. J; NEwLlN SPRAYING APPARATUS Filed May l, 1935 Patented June 2s, 193s UNITED STATES PATENT OFFICE l f E Y 1 2,121,924 l y Y SPRAYING APPARATUS Henry James Newlin, Birmingham,` England l Application May 1, 1935, Seriall No."19,280

2 Claims.

to adischarge nozzle, and the present inventiony "5lparticularly relates to spraying apparatus set.

forth in the specification accompanying my application for Patent Serial No. 8351 oi 1935.

The invention has for itsV object a simplified construction whereby the control trigger or device liactuates both the liquid or like control valve and valve mechanism contro-lling the air feed for obtaining, at will, either a round spray or a fanshaped spray.. A further object of `thisinvention is to `obtain a valve mechanism for controlling the lllair feed which is not liable to get out of order and which is readily adjustable.- A further object of this invention is to enable the air feed for obtaining the fan-shaped spray to be adjustable to obtain the desired form of fan-shaped spray.

Referring to the drawing:-

Figure 1 is a cross sectional elevation of a spray gun constructed according to this invention, and

Figure 2 is a section on line 2-2 of Figure 1.

According to a convenient embodiment of this invention, the gun comprises a frame I in which is mounted the liquid spray needle valve 2 coact-y ing in the usual manner with the spray nozzle,

`the liquid being fed through a suitable duct 3.

The liquid control valvev 2 is actuated by a trigger 4 pivoted on the frame yand having a pin 5 which moves against an adjustable collar 6 on the valve spindle.

The lower portion of the frame, below said needle valve, has a stepped bore 'I into which is fitted a fixed valve seat 8. The compressed air enters the air chamber 9, by way of the duct 9a., and

passes through the opening in the valve seat 8 into the second air chamber Ill. An air control valve II is normally pressed by the spring I2 to 40 close the valve opening and such valve II- is car- V45 abutment member or stop. A link I6 is pivoted at one end to the trigger 4 whilst the other end is engaged on the'valve sleeve I3 between the said abutment nut I 5 and a lock nut I5a. An air conduit I1 passes from the said second air chamber 50 I0 and feeds compressed air to the air cap I8 to give the round spray. A conduit I9 passes from the end of the said second air chamber I0 to thev air cap I8 to give the fan-shaped spray. The conduit I9 is closed to the air feed'by means of a 55 second Valve 20 which seats on a fixed seating 2l, y

the valve 20 being fixed on a valve spindle 22 whichis slidably mounted in the valvefsleeve I3 i aforementioned. The end of this spindle 22 projects beyond the abutment nut I5 fixed on the valve sleeve I3 and the end of the valve spindle is fitted with a screwed adjustable abutment nut 23.

The conduit I9 passes to and from the conical Valve seat 24 and the passage of air through the conduit I9 is regulated by a conical valve 25 which is screw-threaded for engaging a tapped hole in the frame I. The valve spindle 25 passes through a packing gland and terminates in a knurled head 2B for adjusting the valve and consequently theV ow of air to the air cap for producing the `ianshaped spray. y

With the aforedescribed construction, when the trigger 4 is first moved, the link I6 bears against the abutment nut on the valve sleeve I3 and moves the valve II from its seating. Air then flows through the rst air chamber 9 into the second air chamber IIl and through the conduit I l to the air cap. On the further movement of the trigger 4, the liquid control needle valve 2 is opened to supply liquid to the nozzle. Under these conditions a round shaped spray is obtained. If it is required to produce a. fan-shaped spray, the trigger 4 is pulled further back, until the screwed abutment nut I5 on the valve sleeve I3 bears against the nut or stop 23 on the spindle of the second valve, to thereby pull back the second valve 2E) against the pressure of the spring 21. In this latter position of the trigger, air will pass through both conduits I'I and I9 leading to thev air cap. By adjusting the Valve25, in the conduit 'I 9 feeding air for producing the fan-shaped spray,

the desired form of spray can be obtained.

I claim: y

1. Apparatus .for spraying liquids or other materials, comprising a frame, a control valve for the liquid or material to be sprayed, slidably mounted in the frame under control o-f a spring, a spraying nozzle at which occurs, alternatively,

. round and fan vshaped sprays on said frame, a

trigger lever for actuating said liquid control valve pivotally mounted at its upper end on said frame, an abutment on said valve against which the said trigger lever ispressed to open the valve and which abutment is spaced from the trigger when in the inoperative position, a chamber in the frame for receiving compressed air from the source of supply, a second air chamber lin the framev in alignment with the aforementioned chamber, an air control valve coacting with a iiXed seating at the junction of and controlling communication between said chambers,

a sleeve on the said air valve and slidably mounted under spring control in the frame under the said liquid control valve, a spring normally pressing the valve on its seating, an air conduit leading from said second chamber for supplying air to produce a round spray, a second air valve spring pressed on a fixed seating and controlling communication between the second air chamber and an air conduit for supplying air to produce a fan-shaped spray, a spindle on this second air valve slidably mounted in and projecting beyond the said valve sleeve, means whereby the said first air valve, the liquid Valve and the second air valve are successively opened by pressure applied by the said trigger in one direction to obtain either a round or a fan-shaped spray and whereby the spring controlling the rst mentioned air valve controls the position of the trigger lever in the inoperative position, and a separate valve mounted on the frame for controlling the flow of air through the said conduit supplying air to produce the fan-shaped spray in order to ensure a predetermined balance of air passing through the two conduits leading to the spraying nozzle to form a fan-shaped spray.

2. Apparatus for spraying liquids or other materials, comprising a frame, a control valve for the liquid or material to be sprayed, a spraying nozzle at which occurs, alternatively, round and Jian-shaped sprays on said frame, a trigger lever for actuating said liquid control valve pivotally mounted at its upper end on said frame, an abutment on said valve against which the said trigger lever is pressed to open the valve and which .abutment is spaced from the trigger when in the inoperative position, a chamber in the frame for receiving compressed air, a conduit pipe for delivering compressed air from a source of supply to said chamber and passing through a hand grip fixed to the frame, a second air chamber in the Vframe in alignment with said chamber, an air control valvecoacting with a fixed seating at the junction o1" and controlling communication between said air chambers, a sleeve on the said air valve and slidably mounted under spring control in the frame under the` said liquid control valve, a spring normally pressing the said valve on the seating, an air conduit leading from said second air chamber for supplying air to produce a round spray, a second air valve spring pressed-on a Xed seating and controlling Communication with an air conduit for supplying air to produce a fan-shaped spray, a spindle on this second air valve slidably mounted in and projecting beyond the said valve sleeve, a lever connected at one end to the trigger lever and at its other end engaged on the outer end of' the said valve sleeve, so that the valve sleeve is moved on the initial movement of the trigger lever to admit air to the spraying nozzle and so that-the said spring controlling the movement of the valve sleeve returns the trigger to its inoperative position, an adjustable stop on the end of` the valve sleeve projecting from the rear end of said frame against which stop the lever presses for opening the rst mentioned air valve, and a stop on the projecting end of the spindle of the said second air valve, which stop is pressed against on the movement of the valve sleeve for opening the said second air valve.

HENRY JAMES NEWLIN. 

